JPH0243604Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a tool holding device for cutting a cylindrical surface of a workpiece, in particular, a tool holding device for cutting a cylindrical surface of a workpiece. The present invention relates to a tool holding device suitable for cutting a workpiece located closer to the center.

<Prior art> For example, in a device that simultaneously cuts the arcuate corners of a plurality of journal parts on a crankshaft, a plurality of tool holders each having a cutting tool such as a throw-away chip attached to the tip are attached to perform the cutting process. This method requires position adjustment in the axial direction and radial direction of the workpiece for each tool holder.

However, in such a device, a plurality of tool holder bodies are integrally connected by bolts with a spacer of a predetermined size interposed between them, and are attached to a reference block that serves as a position reference in the workpiece axis direction. When adjusting the position of the tool cutting edge on each tool holder in the radial direction of the workpiece using an adjustment bolt that engages with the retraction surface of the tool holder, it is necessary to loosen the bolt that connects multiple tool holders together. If you do so, there is a risk that the tool will move to another tool holder that does not require adjustment, and it is necessary to replace the spacer to adjust the position of the tool cutting edge in the direction of the workpiece axis, which not only causes very poor work efficiency. , there was a problem where fine adjustments could not be made. Therefore, there has been a need for a tool holding device that can adjust the position of the tool cutting edge while each tool holder is fixed.

In addition, the tool disclosed in Japanese Patent Publication No. 54-27593 is known as a device that can finely adjust the position of the tool cutting edge in two-dimensional directions. The abutting lock screw only prevents the cartridge from changing its position in a plane parallel to the feed direction, so if a large cutting reaction force is applied, the cartridge will escape, making it impossible to obtain high support rigidity. I had a problem that didn't exist. In addition, this product has a configuration in which the cartridge is fitted into a recess formed at the tip of the holder, so the width of the tip of the holder becomes large.
When machining a workpiece where the cutting point is close to the center with respect to the swinging outer diameter of the workpiece, such as machining a journal part, there is also the problem that the holder interferes with the part adjacent to the machined part.

<Purpose of the invention> Therefore, the present invention has been developed to enable position adjustment of a tool holding block with a cutting tool attached to the tool holder body in the workpiece axis direction and radial direction without substantially reducing supporting rigidity. It is an object of the present invention to provide a tool holding device that can avoid the problem of interference with an adjacent portion having a larger rotation radius than the machining location.

<Structure of the device> The device of the present invention is to cut the tip of the tool holder body from the front side toward the rear end of the entire width of the tool holder body, and cut the tool holder body in the normal direction substantially perpendicular to the cutting direction of the tool holder body. A support surface and a guide support surface that is perpendicular to the normal support surface and located directly below the cutting point of the cutting tool, and are movable on the guide support surface in a direction parallel to the axial direction of the workpiece. A movable block is guided and supported, and the movable block has a tangential support surface that forms a V-shaped cross section in the workpiece axis direction, and the tool holding block is made narrower in width than the entire width of the tool holder body. The tool holding block has a V-shaped first abutment surface mating with the tangential support surface, and a space between the normal support surface and the normal support surface. A second abutment surface that changes depending on the distance from the tangential support surface is formed, and between the second abutment surface and the normal support surface, both side surfaces are in contact with the second abutment surface. A first adjustment mechanism is provided which interposes a wedge member joined to the surface and the normal support surface, and moves the wedge member in a direction intersecting the tangential support surface; A second adjustment mechanism is provided for moving in a direction parallel to the workpiece axis on the support surface, and the second adjustment mechanism is in contact with an engagement surface formed on the tool holding block and forming an acute angle with respect to the normal support surface. The present invention is characterized in that a clamping mechanism is provided for clamping the tool holding block by pressing the tool holding block against the tangential support surface and the normal support surface.

<Examples> Examples of the present invention will be described below based on the drawings. In FIGS. 1 and 2, 11 is a cutting table 10.
The tool holder body 12 is a tool holding block with a chip 13 attached thereto, and the tool holder body 11 extends in a direction perpendicular to the axis of the workpiece W, and the tip on the side closer to the workpiece W has a A normal support surface 15 that supports cutting resistance in the normal direction is formed parallel to a vertical plane passing through the axis of the workpiece W. Further, a horizontal guiding support surface 16 perpendicular to the normal support surface 15 is formed at the tip of the tool holder body 11, and a movable block 17 is guided and supported in a direction parallel to the axis of the workpiece W. One side of the upper part 17a of the movable block 17 is cut out so that the width is narrower by a certain amount than the width of the journal part J of the workpiece W.
A tangential support surface 18 for supporting tangential cutting resistance acting on the tool holding block 12 is formed at the upper end of a. This tangential support surface 18
The height is formed toward the tip so as to form an acute angle with the normal support surface 15, and the cross-sectional shape in the direction parallel to the axis of the workpiece W is medium as shown in FIG. It has a concave V shape. Note that this tangential support surface 18 may have a V-shape with a convex center.

On the other hand, the first abutting surface 20 formed on the lower surface of the tool holding block 12 is formed in a convex or concave shape that contacts the tangential support surface 18, and a second abutting surface 21 formed on the back surface thereof. is guide support surface 1
The second contact surface 2 is formed such that the distance from the normal support surface 15 increases as the distance from the second contact surface 2 increases.
1 and the normal support surface 15 is a wedge member 2.
2 is interposed and guided and supported so that it can only move up and down relative to the tool holder body 11. An inclined surface 23 corresponding to the tangential support surface 18 is formed in a portion of the wedge member 22 that contacts the second support surface 21, and a normal support surface 23 is formed in a flat portion that does not correspond to the second contact surface 21. A rotary shaft 27 is supported perpendicularly to the tool holder body 15, and an eccentric cylindrical portion 28 integrally formed at the tip of the rotary shaft 27 is a movable cylinder formed on the tool holder body 11, as shown in FIG. It engages with an oval hole 26 having a longer diameter in the direction of movement of the block 17. Therefore, when the rotating shaft 27 is rotated by engaging the rotating tool with the tip engaging portion 27a of the rotating shaft 27, the wedge member 22 moves up and down.

Further, an adjustment shaft 30 is installed on the tool holder main body 11 in a state perpendicular to the guide support surface 6 to prevent axial movement, and a male threaded portion 30a formed at the lower end of this adjustment shaft 30 has a rectangular axial movement. Member 31
are screwed together, and the movable block 1 of this shaft moving member 31
On the surface facing the back surface of the movable block 17, helical teeth 31a are formed which engage with helical racks 32 formed on the back surface of the movable block 17, as shown in FIG. Therefore, the engaging portion 30 of the adjustment shaft 30
When the adjusting shaft 30 is rotated by engaging the rotary tool b, the shaft moving member 31 moves up and down by the action of the threaded part, and thereby the movable block 17 is moved against the workpiece W by the action of the helical teeth. accurately moved in a direction parallel to the axis. In addition, 33 is the movable block 1
7 is clamped to the tool holder body 11 after positioning, and is loosely fitted into a hole 17a formed in the movable block 17, and its threaded portion is screwed into the tool holder body 11.

35 is a clamp member that clamps the movable block 17 after position adjustment, and the upper surface of the tool holder main body 11 and the tool holding block 1 are attached to both ends of the clamp member.
engagement surfaces 36 and 3 formed at the upper rear end of 2 and each forming an acute angle with respect to the normal support surface 15;
7, and the width of the workpiece W in the axial direction is the same as or slightly narrower than the tool holding block 12. This clamp member 35 is prevented from rotating by a dowel pin 38 fixed to the tool holder main body 11, and is provided with a through hole 35a that passes through the tool holder main body 11 in the vertical direction. A clamp bolt 39 having a flange portion that is screwed into the upper end of the clamp member 35 and can be engaged with the upper surface of the clamp member 35 passes through the clamp bolt 39 .

In the tool holding device with the above configuration, when adjusting the position of the tool cutting edge, the clamp bolts 33, 39
Without completely tightening the clamp bolt 33, the movable block 17 is moved by rotating the adjusting shaft 30 to adjust the tool cutting edge position in the direction parallel to the workpiece axis, and the clamp bolt 33 is tightened. Thereafter, the wedge member 22 is moved by rotation of the rotary shaft 27 to adjust the radial direction of the movable block 17, and then the clamp bolt 39 is firmly tightened.

The engagement surface 37 of the tool holding block 12 that the clamp member 35 abuts forms an acute angle with respect to the normal support surface 15, and the normal support surface 15 and the tangential support surface 18 form an acute angle with each other. from,
By tightening the clamp bolt 39, a tightening force is applied to both the normal support surface 15 and the tangential support surface 18 of the tool holding block 12, and the tool holding block 12 is firmly clamped. Furthermore, even if large cutting resistance is applied to the chip 13 during cutting, the force is absorbed by the tool holding block 1.
2 acts as a force to press against the normal direction support surface 15 and the tangential direction support surface 18, there is no risk of positional deviation of the tool holding block 12, and high precision and
Highly efficient machining becomes possible.

The mechanism for moving the wedge member 22 is as shown in FIG.
A drawer portion 41 formed on the wedge member 22 may be engaged between a pair of flanges 40a and 40b formed on the wedge member 22.

<Effects of the invention> As described above, in the present invention, the tip of the tool holder body is cut out from the front side toward the rear end to create a normal support surface and a cutting tool. A guide support surface located directly below the cutting point is formed, a movable block is guided and supported on the guide support surface so as to be movable in a direction parallel to the workpiece axis direction, and a first contact surface is provided on the movable block. Since a tool holding block whose width is narrower than that of the tool holder body is supported through the tool holder body, the tool cutting edge can be finely adjusted in two dimensions by moving this movable block and the tool holding block. Regardless of the movement, the cutting resistance in the tangential direction can be supported by the normal support surface, and the cutting resistance in the tangential direction can be supported by the guide support surface.As a result, the cutting resistance can prevent deformation of the tool holding block or , it has the advantage of eliminating positional deviation and allowing highly accurate machining of workpieces.

Furthermore, in the tool holding device of the present invention, since the tool holding block is stacked and supported on the guide support surface via the movable block, the width of the movable block and the tool holding block can be adjusted independently of the width of the tool holder body. It can be made narrower, and a workpiece with a rotation radius larger than the machining point can be machined without interfering with it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the tool holding device, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line - in FIG. The perspective view, Fig. 4, is − in Fig. 1.
5 is a partial cross-sectional side view of a tool holding device showing a modified example. DESCRIPTION OF SYMBOLS 11... Tool holder main body, 12... Tool holding block, 13... Chip, 15... Normal direction support surface, 1
7... Movable block, 18... Tangential support surface, 22
...Wedge member, 26...Oval hole, 27...Rotary shaft, 2
8... Eccentric cylindrical portion, 30... Adjustment shaft, 31... Shaft moving member, 31a... Teeth, 32... Helical tooth rack, 35... Clamp member, 33, 39... Clamp bolt.

Claims (1)

[Claims for Utility Model Registration] (1) In a tool holding device that holds a tool holding block that fixes a cutting tool to the tip of a tool holder body, the tip of the tool holder body is held from the front side of the tool holder body. A normal support surface whose entire width is cut toward the rear end and is substantially orthogonal to the cutting direction of the tool holder body, and a normal support surface that is perpendicular to the normal support surface and located directly below the cutting point of the cutting tool. A movable block is guided and supported on the guide support surface so as to be movable in a direction parallel to the workpiece axis direction, and a tangential support surface is formed on the movable block. The tool holding block is formed to have a V-shaped cross section in the direction of the workpiece axis, and the tool holding block is formed to have a width narrower than the entire width of the tool holder body, and the tool holding block has a support surface that is mated with the support surface in the tangential direction. a V-shaped first contact surface, and a second contact surface that faces the normal support surface and whose distance between the normal support surface and the normal support surface varies depending on the distance from the tangential support surface. A wedge member is interposed between the second abutment surface and the normal support surface, the wedge member having both side surfaces joined to the second abutment surface and the normal support surface. At the same time, a first adjustment mechanism is provided for moving the wedge member in a direction intersecting the tangential support surface, and a second adjustment mechanism is provided for moving the movable block on the guide support surface in a direction parallel to the workpiece axis. An adjustment mechanism is provided, and the tool holding block is in contact with an engagement surface forming an acute angle with respect to the normal support surface formed on the tool holding block, and the tool holding block is connected to the tangential support surface and the normal support surface. A tool holding device characterized by being provided with a clamping mechanism that clamps a tool holding block by pressing on it. (2) The first adjustment mechanism includes a cylinder that is rotatably supported on the wedge member in a state perpendicular to the normal support surface and that engages with an elliptical engagement surface formed on the tool holder main body. The tool holding device according to claim 1, characterized in that it is constituted by a rotating shaft having a surface eccentrically formed with respect to the rotating axis. (3) the first adjustment mechanism is screwed into the tool holder main body in a state parallel to the normal support surface;
The tool holding device according to claim 1, which is an adjustment bolt coupled to the wedge member so that only movement in a direction parallel to the normal support surface is transmitted to the wedge member. . (4) The second adjustment mechanism has an adjustment shaft that is suspended substantially parallel to the normal support surface, and a threaded portion formed on the adjustment shaft that is threadedly engaged with the adjustment shaft to form the movable block on the outer peripheral surface. Utility model registration claim 1, characterized in that the utility model is constructed by a helical tooth rack and a shaft member formed with helical teeth that mesh with each other.
The tool holding device according to item 2 or 3.